[FWTools] datum shifting in FWTools

Roger André randre at gmail.com
Mon Oct 20 23:11:59 EDT 2008

Thanks Frank,

I'm trying to narrow down the problems I'm having with a projection, and
that "+nadgrids=@null" parameter is new to me.  Someone told me that I might
need to install a separate set of files to enable it.  Just wanted to check
and make sure.

On Mon, Oct 20, 2008 at 8:01 PM, Frank Warmerdam <warmerdam at pobox.com>wrote:

> Roger André wrote:
>> Is it possible in FWTools to use a projection which specifies the
>> following, "+nadgrids=@null"?
> Roger,
> Yes, it should work with the FWTools PROJ.4 tools (and related stuff
> like MapServer).  If you want to use it with GDAL and OGR it is a bit
> more involved.  I think you need to add +wktext in the PROJ.4 definition
> so that GDAL will "capture" the literal PROJ.4 definition in the internal
> WKT representation so the nadgrids part won't get lost.
> Best regards,
> --
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam,
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam<http://pobox.com/%7Ewarmerdam>
> and watch the world go round - Rush    | Geospatial Programmer for Rent
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